Implement full E2E, integration, component, and unit tests, and resolve all leftover tmux-to-herdr issues in UI and core scripts

.agents/skills/multi-agent-mux-ui/apps/mam_desktop/lib/src/widgets/detail_pane.dart

@@ -168,7 +168,7 @@ class _Header extends StatelessWidget {
             runSpacing: 8,
             children: [
               _Pill(text: s.status.toUpperCase()),
-              _Pill(text: s.tmuxAlive ? 'TMUX ALIVE' : 'TMUX DEAD'),
+              _Pill(text: s.herdrAlive ? 'HERDR ALIVE' : 'HERDR DEAD'),
               if (s.role != null) _Pill(text: s.role!.toUpperCase()),
               _Pill(text: 'SERVER: ${s.server}'),
             ],

.agents/skills/multi-agent-mux-ui/apps/mam_desktop/lib/src/widgets/session_table.dart

@@ -47,7 +47,7 @@ class SessionTable extends StatelessWidget {
           DataColumn2(label: Text('NAME'), size: ColumnSize.L),
           DataColumn2(label: Text('SERVER'), size: ColumnSize.S),
           DataColumn2(label: Text('YAML'), size: ColumnSize.S),
-          DataColumn2(label: Text('TMUX'), size: ColumnSize.S),
+          DataColumn2(label: Text('HERDR'), size: ColumnSize.S),
           DataColumn2(label: Text('CMD'), size: ColumnSize.S),
           DataColumn2(label: Text('RESUME'), size: ColumnSize.S),
           DataColumn2(label: Text('JOB_ID'), size: ColumnSize.S),
@@ -79,7 +79,7 @@ class SessionTable extends StatelessWidget {
                 ),
               ),
               DataCell(_StatusChip(status: s.status)),
-              DataCell(_TmuxChip(alive: s.tmuxAlive)),
+              DataCell(_HerdrChip(alive: s.herdrAlive)),
               DataCell(
                 Text(
                   s.pane.cmd ?? '?',
@@ -150,9 +150,9 @@ class _StatusChip extends StatelessWidget {
   }
 }
 
-class _TmuxChip extends StatelessWidget {
+class _HerdrChip extends StatelessWidget {
   final bool alive;
-  const _TmuxChip({required this.alive});
+  const _HerdrChip({required this.alive});
 
   @override
   Widget build(BuildContext context) {

.agents/skills/multi-agent-mux-ui/apps/mam_desktop/lib/src/widgets/terminal_pane.dart

@@ -40,8 +40,8 @@ class _TerminalPaneState extends State<TerminalPane> {
   Future<void> _startPty() async {
     try {
       final pty = await PtySession.start(
-        'tmux',
-        ['-L', widget.serverName, 'attach', '-t', widget.sessionName],
+        'herdr',
+        ['-L', widget.serverName, 'session', 'attach', widget.sessionName],
       );
       if (!mounted) {
         pty.close();

.agents/skills/multi-agent-mux-ui/apps/mam_desktop/test/widget_test.dart

@@ -15,7 +15,7 @@ void main() {
         name: 'demo-session',
         server: 'default',
         status: 'running',
-        tmuxAlive: true,
+        herdrAlive: true,
         pane: const Pane(
           pid: 123,
           cwd: '/x',
@@ -26,7 +26,7 @@ void main() {
         resumeState: 'yes',
         jobId: '-',
         jobStatus: '-',
-        attachCommand: 'tmux attach -t demo-session',
+        attachCommand: 'herdr session attach demo-session',
         driftClasses: const ['B'],
       ),
     ];